6300 Series / Square Seat Steel Bar Stools with a roomier square seat with 16 rivets to prevent bunching. Available in adjustable height and/or backrest. Features a contoured square hardboard seat with 16 rivets. 0.88 inch outside diameter. 18 gauge steel tubing. 0.63 inch outside diameter foot rings are welded to each leg by 4 contact points on each leg for added rigidity. Fixed and adjustable sizes 18 inch high, 24 inch high, or 30 inch high, with optional backrest. Optional backrest; 6 inch high x 12 inch wide adjusts up/down and fore/aft.